user32: Delete the function parameter that don't use and some calls of NC_DrawSysButton

[Ilya Shpigor]

Hi,

I faced with the problem. The sysmenu icons redraw often and this slows the 
work of some applications.

NC_DrawSysButton function draws this icons. There is one parameter of the 
function that don't really used. This is "down" of BOOL type. I suppose, that 
some calls of NC_DrawSysButton with TRUE value of down parameter can be 
skiped, because Its don't do anything except redraw icons.

Can this patch solve my problem and be correct?

--
Best regards
        Ilya Shpigor.
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